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SECURITIES - Available-for-sale Major Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 1,350,740 | $ 1,574,094
Gross Unrealized Gains | 1,894 | 11,403
Gross Unrealized Losses | (75,598) | (21,786)
Fair Value | 1,277,036 | 1,563,711
Agency Notes |  |
Securities available-for-sale: |  |
Amortized Cost |  | 82,476
Gross Unrealized Losses |  | (2,222)
Fair Value |  | 80,254
Treasury Securities |  |
Securities available-for-sale: |  |
Amortized Cost | 247,665 | 247,916
Gross Unrealized Losses | (13,134) | (3,147)
Fair Value | 234,531 | 244,769
Corporate Securities |  |
Securities available-for-sale: |  |
Amortized Cost | 151,382 | 148,430
Gross Unrealized Gains | 980 | 4,354
Gross Unrealized Losses | (4,937) | (754)
Fair Value | 147,425 | 152,030
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") |  |
Securities available-for-sale: |  |
Amortized Cost | 443,266 | 528,749
Gross Unrealized Gains | 905 | 4,271
Gross Unrealized Losses | (26,055) | (6,566)
Fair Value | 418,116 | 526,454
Agency collateralized mortgage obligations ("CMOs") |  |
Securities available-for-sale: |  |
Amortized Cost | 469,808 | 527,348
Gross Unrealized Gains | 7 | 2,705
Gross Unrealized Losses | (29,632) | (8,795)
Fair Value | 440,183 | 521,258
State and municipal obligations. |  |
Securities available-for-sale: |  |
Amortized Cost | 38,619 | 39,175
Gross Unrealized Gains | 2 | 73
Gross Unrealized Losses | (1,840) | (302)
Fair Value | $ 36,781 | $ 38,946

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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